The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 1991
Filed:
Jul. 29, 1988
Hiroshi Fuji, Tenri, JP;
Tsuneo Fujiwara, Tenri, JP;
Takashi Iwaki, Nara, JP;
Tomiyuki Numata, Tenri, JP;
Kentaroh Tsuji, Nara, JP;
Shigemi Maeda, Yamatokohriyama, JP;
Takeshi Yamaguchi, Nara, JP;
Kunio Kojima, Nara, JP;
Toshihisa Deguchi, Nara, JP;
Shigeo Terashima, Tenri, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An apparatus for recording and reproducing information on and from an optical disk includes a first control for producing a first control signal for controlling the rotational speed of a rotational driving apparatus, on the basis of the detected radial position; a judging apparatus which judges whether or not the reproduced signals are reproduced from a recorded region of the optical disk; a second control for producing a second control signal for controlling the rotational speed of the rotational driving apparatus, on the basis of the signals reproduced from the disk; and a switch apparatus which switches the circuit so that the rotational driving apparatus is controlled by the first control signal when the reproduced signals are not reproduced from a non-recorded region, and controlled by the second control signal when the reproduced signals are reproduced from a recorded region.